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Dietary supplements containing all eight are referred to as a vitamin B complex. Individual B vitamins are referred to by B-number or by chemical name, such as B 1 for thiamine , B 2 for riboflavin , and B 3 for niacin , [ 1 ] [ 2 ] while some are more commonly recognized by name than by number, such as pantothenic acid (B 5 ), biotin (B 7 ...
Although given the name "Vitamin B 15" by the Krebses, there is no evidence that it meets the definition of a vitamin as there is no evidence it is a nutrient needed by the body. [ 6 ] Much of the clinical research on pangamic acid took place in the former Soviet Union, though that research often did not describe which of the many compounds ...
Vitamin B 12 is derived from a tetrapyrrolic structural framework created by the enzymes deaminase and cosynthetase which transform aminolevulinic acid via porphobilinogen and hydroxymethylbilane to uroporphyrinogen III. The latter is the first macrocyclic intermediate common to heme, chlorophyll, siroheme and B 12 itself.
The structure of vitamin B 12 was the first low-molecular weight natural product determined by x-ray analysis rather than by chemical degradation. Thus, while the structure of this novel type of complex biomolecule was established, its chemistry remained essentially unknown; exploration of this chemistry became one of the tasks of the vitamin's chemical synthesis.
Biotin (also known as vitamin B 7 or vitamin H) is one of the B vitamins. [ 1 ] [ 2 ] [ 3 ] It is involved in a wide range of metabolic processes, both in humans and in other organisms, primarily related to the utilization of fats, carbohydrates, and amino acids. [ 4 ]
Vitamin D with or without calcium doesn't reduce the risk of falls or fractures in generally healthy older adults, according to a new draft recommendation from the US Preventive Services Task Force.
You've heard it a million times: Eat fewer calories, lose weight. But what if you're in a calorie deficit—consuming fewer calories than you're burning—and still not losing?
Pantothenic acid (vitamin B 5) is a B vitamin and an essential nutrient. [6] All animals need pantothenic acid in order to synthesize coenzyme A (CoA), which is essential for cellular energy production and for the synthesis and degradation of proteins, carbohydrates, and fats. [6] [7] Pantothenic acid is the combination of pantoic acid and β ...
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